One of this year's hottest toys is based on technology that's had a hard time attracting adults. LeapFrog's Fly Pentop Computer ($99.95 MSRP, ages 8-13) is based on the same technology is the Logitech io Digital Writing System from Anoto of Sweden.

Basically, Anoto has created a sensor that reads barely visible patterns printed on special paper (LeapFrog calls their's "Fly paper") to capture handwritten documents in electronic form. LeapFrog's version not only writes but also works as a calculator, scheduler, music recorder, plays games, translates, and helps with homework. Additional applications cost between $5 and $35 additional.

While business adoption has been slow for the Logitech product (which would seem to be very useful in some applications), the LeapFrog Fly seems to be, well, flying off store shelves. The device is easy to learn and use, giving kids some neat computing features that their parents won't have.